铜钢异种材料等离子弧焊接头性能  

Plasma arc welding of copper-steel dissimilar metals

作　　者：程东海[1] 邵景辉[1] 陈益平[1] 胡德安[1] 

机构地区：[1]南昌航空大学航空制造工程学院,南昌330063

出　　处：《焊接学报》2012年第9期97-100,118,共4页Transactions of The China Welding Institution

摘　　要：采用LHM-200等离子弧焊机对1 mm紫铜与低碳钢异种材料进行了熔透型等离子弧焊试验,得到了内部无缺陷、外观成形良好的接头.观察了接头的显微组织,并分析了工艺参数对接头力学性能的影响.结果表明,焊缝区中心显微组织呈细胞群状,界面两侧的组织特征呈现显著的不同,焊缝与铜侧界面没有明显的熔合线,局部呈漩涡状,钢侧与焊缝连接处出现了明显的分界线;最佳工艺为焊接电流为65 A,焊接速度为0.4 cm/s,离子气流量为0.7 L/min,此时接头抗拉强度可达176 MPa,试样断裂于铜母材热影响区.Experiment research on plasma arc welding of dissimilar metals between T2 copper and Q235 steel was carried out with LHM-200 plasma arc machine.A defect-free joint with good weld appearance was obtained.Microstructure of welded joint were analyzed by optical microscopy,and the effect rules of process parameters on mechanical properties of joint were analyzed.The results indicated that microstructure of the center of weld bead was like cell population shape.The microstructure characteristics of weld bead close with Cu-based metal was different with that close to Fe-based metal.The optical welding parameters were 65 A of weld current,0.4 cm/s of welding speed,0.7 L/min of plasma flow,and the tensile strength of welded joint reached 176 MPa with these parameters,and the fracture happened at the HAZ of copper side.

关 键 词：铜钢异种材料 等离子弧焊 接头性能 

分 类 号：TG442[金属学及工艺—焊接]